Throttle-operating mechanism for explosion motors



R. ESNAULT-PELTERIE.

THROTTLE OPERATING MECHANISM FOR EXPLOSION MOTORS.

APPLICATIO N man DEC. 9. 191 9.

Patented Dec 12,1922;

Patented Dec. 12, 1922.

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THROTTLE-OPERATING MECHANISM FOR EXPLOSION lVlEOTORS.

Application filed December 9, 1919. Serial No. 343,868.

To all whom it may concern:

Be it known that 1, ROBERT EsNAUnr-PnL- 'rnnm, a citizen of the French Republ1c, re siding at l3 Boulevard Lannes, Paris, Seine, in the Republic of France, have invented certain new and useful Improvement 1n Throttle-Operating Mechanism for Explosion Motors, of which the following is a specification.

This invention relates to operatlng mecha nism for the throttle of explosion motors and more especially those of automobile vehicles.

Hitherto the operation of the throttle has always been effected by a simple rod con necting the accelerating pedal or hand-lever to the operating lever of the throttle. The result is that at a slow speed a very small movement of the foot or of the hand, of the driver causes a very considerable varlation of the opening of the throttle and therefore an erratic behaviour of the motor. It is known in practice that when the valve of a carburetter is nearly closed, a very small variation of opening occasions a very great change of admission of fuel.

H In the case of automobile motors when running at a slow speed all drivers know that the jolting caused by a rough and bumpy road is liable to cause by inertla,

involuntary movements of the foot which bring about abrupt jerks in the running of the motor.

On the other hand even a slight movement of the pedal produces at any positlon of the stroke a variation of opening of the throttle which is substantially constant.

The result of this is that when the throttle is fully open, the inverse defect of the foregoing is produced that is, the opening for the passage of the gases is not more than feebly affected in relative value by the same movement of the foot, or of the hand,and the operation lacks sensitiveness.

The arrangement which forms the subject matter of the present invention has for its object to obviate this disadvantage by permitting at slow speed only an extremely small variation of opening for a large movement of the pedal and conversely for large openings.

This invention, therefore, consists in providing means for operating the throttle of explosion motors characterized by the fact that the sensitiveness of the operating mechanism is practically constant at all speeds whereby erratic behaviour of the motor is obviated.

The accompanying drawing shows by way of example, two practical methods of carrying out the invention and will render the peculiarities and advantages thereof properly understood.

Figure 1 represents diagrammatically the ordinary known arrangement.

Figure 2 is a similar view showing mecha nism in accordance with this invention.

The same parts are denoted by the same reference letters in Figures 1 and 2 AE denotes the operating pivoted at B,'AC is the rod which transmits the movement to the butterfly valve or throttle D of the carburetter.

In order to express mathematically the characteristics of these two arrangements, let 7. be the angle which the throttleinakes with its original closed position, m the move ment of the pedal necessary to effect that opening and K the constant.

An ordinary operating mechanism, such as that shown in Figure 1, approaches practically the condition =K (Equation Noad x=K (Equation No. 2)

that is to say, in proportion as the opening of the throttle or butterfly valve increases, movements of the pedal of an amplitude dw produce greater angular movements of the throttle.

The exact solution may be obtained by means of a cam control, but strict exactness is not necessary and simplicity should govern everything.

In the arrangement illustrated in Figure 2 the accelerator pedal E is arranged in such a way that at a low speed the operating rod AC is only slightly above the pivot B, that is to say, the levers AC and AB make a small angle between them.

lever and pedal,

On acceleration, on the contrary, the rod I AC is brought to the position AC, that is, nearly at right angles to the arm AB which is then in the position A B.

The lever CD which operates the throttle, on the contrary, forms at slow speed an angle of nearly 90 with the rod AC while p311 gcceleration it forms an acute angle A Either of these two conditions would suffice to produce the result sought by approaching sufficiently the mathematical condition indicated.

It must also he understood that the mechanical arrangements may be slightly modified in order to best suit the different 5 speed.

2. In mechanism for operating the throttle of exploslon motors a rod connecting the pedal-lever to the throttle of the carburettor so arranged that at slow speed the said rod makes with the pedal-lever a very small angle and with that of the throttle approximately, or quite, a right angle and conversely when the motor is running at high speed. v p

8. Mechanism for operating the throttle of explosion motors comprising an operating lever pivoted to the frame at the opposite end to which the accelerator pedal is attached and made in two portions in clined the one to the other, a rod pivoted at one end to'said operating lever at the junction of the said two portions and in the position occupied at low speed forming only a very small angle with the lower portion of the operating lever and at its other end to a rod directly connected to the throttle so that it forms therewith approximately a right angle in the position occupied at, low speed.

In testimony whereof he aflixes his signature in presence of a witness.

ROBERT ESNAULT-PELTERIE. Witness: I

HENRY T. Winoox. 

